P42s are geared for 110mph, but since the highest speed anywhere in Canada is 100mph....well, you get the picture. The F40s are technically geared for 90mph, but as they are getting rebuilt they are "upgraded" for 95mph.
As for equipment, the LRCs were only allowed to operate at LRC speeds with the banking enabled. It has been disabled for a good number of years now (and is removed in the rebuilds) and so they are limited to the passenger speeds. VIA is looking at having the suspension system redesigned in the cars, so it is possible that they may be allowed to again run at LRC speeds in the future. The Ren cars, on the other hand, are now allowed to operate at the higher LRC speeds.
As for track speeds, there are locations on the Kingston Sub where the passenger speed is 100mph (provided the equipment can hit that speed, of course). In most cases, and around the GTA, it tops out at 95mph (and before any Permanent Speed Orders - PSOs) might take effect.
As Vegeta wrote, the MP40s are geared for a max of 93mph. GOs equipment is cleared to operate at whatever the nominal passenger speed of that line is, so in theory they can operate at 100mph in those locations if they had the motive power to provide it.
Dan
Toronto, Ont.