Question

Under existing conditions railway travel is expensive. [ Add question tag]​

Answer 1

Answer:

isn't it ?

Explanation:

Isn't it will be used as a question tag because is is the verb in here.

Answer 2

Answer:

$\large\mathcal\green{Isn't \: it?}$

Under the existing conditions railway is expensive, isn't it

Explanation:

Hope it helps !!!