**no no, NOT Jammu Tawi Express…Its Himsagar Express…used to originate from Jammu, then was extended to PaThankoT and now to Udhampur.
Arlie bro, i did not shoot this video. u prolly know that there are thousands of Train Gricers all over india. these train enthusiats shoot videos, take pictures, travel aboard locomotives…i guess they get special permits to do that from the mInistry of Railways.
yes, u r right…without permission, its illegal to shoot videos and also very dangerous 
**