by Sand Box John
The 1k cars won't be retired until well after Phase II of the N Route Silver line opens. The first 2 batches of 64 cars of the 7k procurement are for the N Route Silver line. The next 300 are to replace the 1k cars. 220 more after that will expand the fleet. Sometime after the delivery of the first 128 cars the schedule call for doing a full rehabilitation to the 100 4k cars. I don't think the 1k cars will be pulled from service until 428 of the 7k cars are in revenue service.
John in the sand box of Maryland's eastern shore.