Zip ties used on the undercarriage of a #7train..is this standard? How often are these checked for wear and tear? @MTA @NYGovCuomo @ABC7NY pic.twitter.com/V2WhtfQo2G — MsJaya_B (@MsJaya_B) June 28, 2017

At more than $1 million per subway car, you’d think they’d be held together with something more than zip ties.

A savvy straphanger noticed a homespun addition to her 7 train Wednesday morning when she saw part of the car fastened with zip ties.

“Zip ties used on the undercarriage of a #7train..is this standard?” tweeted MsJaya_B. “How often are these checked for wear and tear?”

With all the problems the MTA has had recently, writers can hardly be blamed for thinking the worst.

An MTA spokeswoman said Wednesday that the zip tie was being used as a temporary fastener to attach a cable to the new R186 cars while a special part is being made. She added that the cable is attached another way, and the zip tie is just a back-up.

“The ties are a back-up way of securing a cable on the subway car. It’s used in conjunction with other fasteners,” said MTA spokeswoman Beth DeFalco. “It’s 100 percent safe and only used on some cars on the #7 line. We have a specially designed bracket that is being engineered and is set to be installed in the next few weeks.”