The quality issue is common across numerous items of DLC. Take the Class 70 for example. No tail lights. Wipers don't work, fairly awful engine sounds. The Class 68 also has engine sound issues. These are the sort of things that should be ironed out at beta stage and if anything does slip through, it should be updated as a matter of course as soon as is reasonably possible. The errors with the BR blue Mk1s took ages to be rectified, the two glaring ones being bogies with static wheels and the blue being very wrong. I have no issue paying for stuff but get it right.