BART officials said they expect an update from the engineering crew at some point Monday.
RELATED: #DearBart: Riders sound off on crowded trains
On Sunday, crews continued to test the stretch of track between a station and the Pittsburg/Bay Point BART Station. They're trying to figure out why voltage is spiking.
BART officials even flew in an expert from the East Coast to help. So far, crews have not been able to identify the source of the problem that has knocked 50 cars out of service.
The reduction in cars is majorly impacting riders system wide.
RELATED: BART addresses questions about delays on social media
Passengers told ABC7 News trains were much more crowded than usual and that made for a less pleasant commute. "They're trying to move more people with less trains and it's hard," BART rider Jose Alba said.
"It's going to cause some stress, some problems, mostly just people in a hurry at the end of the day, they're tired, want to go home," BART rider Earl Romiti said.
The good news is riders report the bus bridge works relatively well. As soon as a train arrives and everyone files into the bus, it takes off for the Pittsburg/Bay Point BART Station.
RELATED: BART officials explain what's causing delays, damage
BART will be fixing damaged train cars over the next couple of weeks while waiting on a necessary part that can take months to order.
You can also join the conversation by posting on social media with the hashtag #DearBART. We're looking for video messages or comments that you want shared. We might use them on air or online.
For more stories about BART, click here.
So far so good on test train between North Concord and Pittsburg/Bay Point pic.twitter.com/1b0exVUgN5— Tiffany Wilson (@TWilsonTV) March 21, 2016
We are approaching Pittsburg/Bay Point now. Made it! pic.twitter.com/baw3AXarBe— Tiffany Wilson (@TWilsonTV) March 21, 2016