Firefighting and rescue trucks with rail wheels are fairly common in Germany, and are also to be found in several other countries. But this example is the largest I have come across so far! If anyone has ever driven a regular truck along a rail line for any distance, with the attendant level of vibration, he or she will understand the benefits of having a set of dedicated rail wheels...
Ed: for a British examples see
Added by Rob Johnson on 15 November 2020.