(19 Apr 2014, 8:19 pm)mb134 wrote Would it not have been sensible to put the newer,more reliable, ones on the more premium service though to aid time keeping and reliability? And will they alternate the spare so that one desnt have far less milage than the others?
7501-8 along with at present 7 of the on-order E400s are to be used on the X21/X22. The remaining 5 new examples are to be used on the X18 (which requires 6 buses, go figure) while another 4 of the current E400s refurbished for the X14/14.