Generally these locomotives were used for yard switching, small freights, rare local routes, or as helpers and were geared for only 40-50 mph. You can however change the technical specifications if you want.

X:\Program Files (x86)\Steam\SteamApps\workshop\content\446800\911974091\res\models\model\vehicle\train\usa\alco_NewHaven3_hh600.mdl

and

X:\Program Files (x86)\Steam\SteamApps\workshop\content\446800\911336807\res\models\model\vehicle\train\usa\alco_NYC_hh600.mdl

are the directories to each of the mods.
Change X:\ to what ever drive you have steam workshop install mods to.

You can change the speed (in Kilometers / Hour) near the bottom of the file.
Additionally you may want to just copy the entire mod folders over to your mods directory in the games main folder so if I update the mod it wont overwrite any changes you make.

The repaint is awesome but the power and speed is not according to passenger transport, too slow. Can you add some speed and power to this and "new york central" to be more viable for passengers?

Very nice, thanks.