Champaran HumSafar Express : इन अजनबी सी राहों में, जो तू मेरा हमसफ़र हो जाये, बीत जाए पल भर में ये वक़्त, और हसीन सफ़र हो जाये. - Piyush Singh

Nice captures! This locomotive has been the subject of many long discussions. It's always nice to see it popping up in photos.
Just a correction though. This locomotive is NOT the Thomson. The locomotive that was used at the Roorkee construction site was destroyed in a Boiler explosion within 9 months of it's induction. There are no particular details in the administration reports about the make and build of the locomotive other than the fact that it was a 2-2-2 Tank locomotive. The locomotive currently outside Roorkee station (the one in your photograph) is a 'Jenny Lind' locomotive that operated on the London, Brighton and South Coast railway (as you can see on the locomotive in pic...
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3) in England in the late 1840's. In fact, you can even see the name 'Jenny Lind' on the nameplate on the boiler in Pic 4. This is just a representative piece for demonstration and NOT the actual loco that worked in Roorkee 160 years ago. There is no indication in any of the administration reports from that time that the Thomson was a 'Jenny Lind' type locomotive. Several IRFCA veterans have also concluded that the Thomson was probably not the same type of locomotive as the one plinthed outside the Roorkee station.
That aside, the Thomson is not the first locomotive of India. The Red Hill railroad in Madras holds that distinction. Two (or possibly 3) steam locomotives operated on the RHRR on an experimental basis. The first was a tank type engine and the latter, a locomotive with a tender to hold coal and water. And moreover, all the locomotives, wagons and rails used in the RHRR were 'Made in India'. They were manufactured in the Ironworks at Porto Novo ( Now Parangipettai, PO on the Villupuram-Cuddalore-Mayiladuturai route) by the Madras Corps of Engineers working under Sir Arthur Cotton.