Class 168 and 165 combo

[oversteer]

For the last two days my normal train has been made up of a 4-car 168 and 2-car 165 set coupled together. I thought one set would be closed up but they were all in service.

It's normally just the 165s. Why would Chiltern be doing this rather than running them as separate services?

Do all the engines run together? Does this not create any issues with different levels of power, braking etc ..

 

[mumrar]

For the last two days my normal train has been made up of a 4-car 168 and 2-car 165 set coupled together. I thought one set would be closed up but they were all in service.

It's normally just the 165s. Why would Chiltern be doing this rather than running them as separate services?

Do all the engines run together? Does this not create any issues with different levels of power, braking etc ..

The control software can sort out any power discrepancies, although from 0-30mph the 165 will accelerate far better. 153s working with 170s are regular for London Midland with no issues there, so there's no reason for problems in the pair you saw.

The only issue is that the formation is limited to 75mph of course.