A couple of examples:

Vinod Chandra, K. Vijaya Kumar,

Reliability and safety analysis of fault tolerant and fail safe node for use in a railway signalling system,

Reliability Engineering & System Safety,

Volume 57, Issue 2,

1997,

Pages 177-183,

ISSN 0951-8320,

https://doi.org/10.1016/S0951-8320(97)00020-3.

Norman Weik, Nils Nießen,

A quasi-birth-and-death process approach for integrated capacity and reliability modeling of railway systems,

Journal of Rail Transport Planning & Management,

Volume 7, Issue 3,

2017,

Pages 114-126,

ISSN 2210-9706,

https://doi.org/10.1016/j.jrtpm.2017.06.001.

(http://www.sciencedirect.com/science/article/pii/S2210970617300380)

Jean-Luc Wybo,

Track circuit reliability assessment for preventing railway accidents,

Safety Science,

Volume 110, Part B,

2018,

Pages 268-275,

ISSN 0925-7535,

https://doi.org/10.1016/j.ssci.2018.03.022.

(http://www.sciencedirect.com/science/article/pii/S0925753518300316)

Hope this helps...

Thank you so much. I was quiet stuck on Literature review. Thank you.