Here is a couple of things that it could be great to see in the depot's window.
1) power, gear and ... final power : display next to the gear value, the final power (power * gear).
2) When a convoy is in the depot, its max speed is displayed, why not show the total power (counted with gear), weight, (why not power/weight ? for empty and full convoy), capacity.
(2) Is already in Simutrans-Experimental.
maybe, but it would be great in Simutrans Simutrans ;)
This is also needed in the convoy details window.
There is only finite space, and the depot window is not supposed to be larger, to keep it usable on smaller screens. A sub-dialogue may be set up to contain more information, e.g. showing a list of the values for the different possible goods (which cause different weights of the convoy when it is loaded).