The Tejas Express is a semi-high speed fully air-conditioned train Introduced by Indian Railways in 2017. Recently, an image of a train decorated with lights is viral across social media with a claim of it being the Tejas Express.
A Twitter user @EkVishwa shared the video with a caption that reads “तेजस एक्स्प्रेस, मुंबई ते गोवा, कोंकण रेल्वे. नाताळ निमित्त दिव्यांची रोषणाई 👌👍
Tejas Express Mumbai to Goa lit up for Christmas ❤️❤️ “.Archived | Twitter

(Source:Twitter/Screenshot)
Another Twitter user @aniltalwar2 shared the video with a caption “Tejas express.Mumbai to Goa via Dudhsagar. Lit up for Christmas.” Archived |Twitter

(Source:Twitter/Screenshot)
A Facebook user Anand Deshmukh shared the video with a caption “Mumbai to Goa Tejas Express..!
Christmas Special…❤️🤔”.The post can be found here.

(Source:Facebook/Screenshot)
Another Facebook user Nandu Goa shared the video in a Facebook group with a caption “Tejas Express, Goa to Mumbai Train”.

(Source:Facebook/Screenshot)
Another similar post can be found here.
FactO Check:
A reverse image search of some keyframes from the video directed us to an YouTube video uploaded on Dec 2, 2021 by a verified channel with a description
“Mesmerizing footage captures the first official run of the Train of Lights 2021 as it passes through Goodrington, Nr. Paignton.
Scott Williams, professional photographer made his way to railway bridge in Goodrington, Nr. Paignton on a cold November night to get a glimpse at the most spectacular sight.
Footage shows a Dartmouth steam railway steam train COVERED front to back in Neon LED lights bellowing down the tracks.”
We also found the same video posted by Scott Williams Photography on a Facebook page.

(Source:Facebook/Screenshot)
Conclusion:
Train decorated for christmas in England is shared as India’s Tejas Express.