A metro line had cracks in its pillars. The company walked away. The court said: that's fine.

The pillars were cracking. The train was running. The contractor gave 90 days to fix it. When nothing happened, they terminated the deal. A three-member arbitral tribunal agreed that the termination was valid and awarded Rs. 2,782 crore to the contractor. Then a two-judge bench of the Delhi High Court threw that award out, saying the tribunal had read the contract wrong. The Supreme Court had to decide one question: when can a court tell an arbitrator they got it wrong?

The answer, it turns out, is almost never.

When the concrete started to fail

The Delhi Airport Metro Express Line was meant to be a showpiece—a high-speed link from New Delhi to Indira Gandhi International Airport, covering the distance in 18 minutes. The Delhi Metro Rail Corporation (DMRC) hired Delhi Airport Metro Express Pvt. Ltd. (DAMEPL) as the concessionaire to build and run the line. Under the agreement, DMRC was responsible for the civil structure—the pillars, girders, and the bearings that allow the structure to expand and contract with temperature—while DAMEPL handled the systems, trains, and operations.

Commercial operations began in February 2011. Within months, DAMEPL's engineers noticed something wrong. The concrete girders supporting the elevated track had developed cracks. Some pillars showed twists. The bearings were failing. This was not cosmetic damage. This was structural. The kind of defect that, left unaddressed, could compromise the safety of a running train. The inspection reports piled up on the desk; each page added weight to the growing file.

DAMEPL issued a cure notice to DMRC on July 9, 2012, under Article 29.5.1 of the concession agreement. The clause gave DMRC 90 days to fix the defects. DAMEPL's position was simple: you built the civil structure, it's failing, and the contract says you have to fix it within this window. DMRC did not fix the defects within 90 days. On October 8, 2012, DAMEPL terminated the agreement. The decision to walk away was not taken lightly—the termination notice, once signed, ended a partnership that had begun years earlier.

The tribunal says: termination was valid

The dispute went to a three-member arbitral tribunal. DMRC argued that the defects were not serious enough to justify termination. They pointed to a safety certificate issued by the Commissioner of Metro Rail Safety (CMRS)—a statutory authority under the Delhi Metro Railway (Operation and Maintenance) Act, 2002, which certifies whether the line is safe enough to run trains—which certified that the line was fit for operation. If the CMRS says it's safe, DMRC argued, how can DAMEPL say the structure is defective?

The tribunal disagreed. It held that a safety certificate from a statutory authority and a contractual cure notice serve two entirely different purposes. The CMRS checks whether the line is safe enough to run trains. The cure notice checks whether DMRC has met its contractual obligation to deliver a defect-free civil structure. A train can be safe to run and still have structural defects that violate the contract. The tribunal upheld DAMEPL's termination and awarded Rs. 2,782.33 crore as the termination payment under Article 29.5.2 of the agreement.

DMRC challenged the award before a Single Judge of the Delhi High Court under Section 34 of the Arbitration and Conciliation Act, 1996—the provision that allows a court to set aside an arbitral award on limited grounds. The Single Judge dismissed the petition in March 2018, upholding the award. DMRC appealed to a Division Bench under Section 37 of the same Act—the provision for appeals against orders under Section 34.

The Division Bench reverses everything

In January 2019, the Division Bench did what courts are not supposed to do: it re-read the contract and substituted its own interpretation for the tribunal's. The Division Bench held that the tribunal's findings were "perverse" and "patently illegal"—two of the narrow grounds on which a court can set aside an arbitral award. It said the tribunal had misread Article 29.5.1, that the defects were not serious enough to trigger the cure notice, and that the computation of the termination payment was flawed.

This was a significant reversal. A Single Judge had already examined the award and found no reason to interfere. The Division Bench, hearing an appeal against that decision, was supposed to apply an even narrower standard of review. Instead, it conducted what the Supreme Court would later call a full-fledged reappreciation of evidence—exactly what the Arbitration Act forbids. The order came down from the bench; the reversal was complete.

The Supreme Court's answer

DAMEPL appealed to the Supreme Court. The bench, led by Justice L. Nageswara Rao, delivered its judgment on September 9, 2021. The court did not mince words.

The Supreme Court held that the Division Bench had exceeded its limited power of review under Sections 34 and 37 of the Arbitration Act. The court cited its own precedents—Associate Builders v. Delhi Development Authority (2015) and Ssangyong Engineering and Construction Co. Ltd. v. NHAI (2019)—to lay down the law in clear terms. A court cannot set aside an arbitral award merely because it would have interpreted the contract differently. The arbitral tribunal's interpretation, if it is a plausible one, is final. Patent illegality—the ground on which the Division Bench had relied—must go to the root of the matter. A mere error of law or a different reading of a clause does not qualify.

The court also addressed the CMRS certificate argument head-on. The Division Bench had treated the safety certificate as conclusive proof that the defects were cured. The Supreme Court said no. The two inquiries—statutory safety and contractual compliance—are distinct. A train can be safe to run and still have defects that give the other party the right to terminate the contract.

On the question of perversity, the court held that a finding is perverse only if it is based on no evidence at all or if it ignores vital evidence. The tribunal's factual conclusions, even if debatable, cannot be labelled perverse merely because a court would have drawn different inferences from the same material. The Supreme Court's judgment restored the arbitral award in its entirety, setting aside the Division Bench's order of January 15, 2019.

Why the Supreme Court stopped the second-guessing

The procedural journey of this case is instructive. The arbitral tribunal delivered its award on May 11, 2017. The Single Judge upheld it on March 6, 2018. The Division Bench reversed it on January 15, 2019. And finally, the Supreme Court restored the original award on September 9, 2021. Over four years, the dispute travelled through three levels of court, only to return to where it began—with the tribunal's word as final.

For advocates, CFOs, and founders reading this, the judgment is a reminder of a fundamental principle: arbitration exists precisely because parties want their disputes decided by experts in the field, not by generalist judges. When you sign an arbitration agreement, you accept that the arbitrator's reading of the contract—even if it is not the reading you would have chosen—is binding. The court's role is not to correct errors. It is to catch fraud, bias, and findings that have no basis in evidence at all.

The Division Bench's error was treating the appeal under Section 37 as a chance to re-decide the case. The Supreme Court corrected that error. The arbitral award of Rs. 2,782 crore was restored.

Consider the contrast with a case like Ssangyong Engineering, where the Supreme Court clarified that a court can interfere only if the tribunal's view is one that no reasonable person could hold. Here, the tribunal had a plausible basis for its interpretation of Article 29.5.1—the 90-day cure period, the nature of the defects, and the distinction between statutory safety and contractual compliance. The Division Bench's attempt to re-evaluate that evidence was precisely what the law prohibits.

THE PLAY: When challenging an arbitral award, do not argue that the tribunal got the contract wrong—argue that the tribunal's finding is so unsupported by evidence that no reasonable person could have reached it.

The pillars were cracking. The train was running. The court ended where the contract began: with a 90-day notice and a contractor who walked away. The question for every business now is simple—if your arbitrator reads the contract differently than you do, can you live with that?