Its meters per second Bill
Here's a link to a handy dandy converter from mph to m/s. Click on all speed conversions for more options, http://www.calculateme.com/Speed/index.htm
Thanks. This helped alot. In trainz classics, I edited the Metro North M7 to run at 100mph instead of 73mph. That converter for the website above is helpful. It gives trainz classics sort of a realistic feeling, speed wise.
The maxspeed tag in the Motor container of an enginespec only applies to AI and DCC modes. The max speed in CAB mode is controlled in the throttle container of a diesel and is a more involved change to make. Cab mode for a steamer is a totally different animal.