I have no idea About 40 to 60 fps? I never checked it. Everything works so good.
Greetings for your girlfriend
My specification:
Trainz Simulator 2010 build 49933
Intel Core i7-7700k @4.5 GHz
Gigabyte GTX 1070 G1 Gaming
2x 8 GB DDR4 3200 MHz Vengeance Corsair LPX
MBD Asus TUF Z270 Mark 2
Cooler Be Quiet Dark Rock 3
SilentiumPC Deus M1 650W Bronze Plus
Fractal Design Define R5 (7x 140mm fan)
Samsung SSD850 Evo 250 GB M.2
1x extra SSD
2x old HDD
Trainz works on Samsung Evo (with Windows 10 + some games).