PITTSBURGH — (WPXI) – Light rail service was impacted at several T stations in Pittsburgh and the South Hills on Tuesday. Service was suspended between the North Side and Gateway stations due to a possible electrical issue. Bus shuttles were called to operate between these two stations. In a separate incident, a PRT spokesperson said it appears that a set of wheels on a rail car came off the track. That car was not in service and no passengers were involved. Single-track operation where in effect between Washington Junction and Private Drive in the South Hills. All Blue and Red line cars will be boarding and alighting passengers from the inbound platform at Washington Junction until further notice.