Track Maintenance Vehicles

What is this thing? It air conditioned and initially i thought it was some kind of excavator coming on rails. Spotted at Calicut. (Deepak)

General Manager, Northern Railway’s Inspection Car ‘Parakh’ zips by close to Faridabad.
(Video: http://www.youtube.com/watch?v=7u39d4zWVts) (Shikhar Parjan)

An increasingly endangered species - a metre gauge breakdown crane at Udaipur City. As the letters stencilled on the boom indicate, this was probably homed at Hanumangarh when the canal loop and surrounding lines were active. (Manish)