I didn't convert them, the sectional appendix has displayed in mph vaule, so that is the vaule which was put in. As the trains use mph in the core, if the vaule was in kmph it would have a k after the number to indicate that's it is kmph as shown on Cambrian line, however no k means it is in mph. https://www.whatdotheyknow.com/request/crossrail_central_operating_sect_3