Thank you for the kind words
The hoses are all USA Trains parts which I have slightly modified to give a more realistic appearance.
The following photos show the parts that I use from USA Trains. I get them in bulk from the spares department at Charles Ro, the retail front end of the company. They are extremely helpful and have a large stock of all the detail and replacement bits from their stock:
The larger air hose is one from the boxcar range and I use it to add train line brake hose detail to rolling stock that has it missing. The lower pipe is originally from the NW2 I believe and I use this piece mainly to model the trainline brake hose on locomotive pilots, etc. I basically just cut the centre section out leaving me with two pieces: the hose end and the glad hand. I file the cut smooth, then I use a pin vice to drill out two small holes in each piece. Using a piece of black single core cable, I strip back a couple of milimetres off the outer flex and then superglue this into the holes. It is important to select a cable which is the right diameter to match the existing bits.
This method gives the hoses a much more natural look as the real thing was never dead straight, plus the cable gives it a realistic drooping look. The only other thing is to paint the glad hand piece a metallic silver colour. I found a really nice colour from the Games Workshop, "Bolt Gun Metal" that is slightly darker and thus gives a heavier metal colour than sparkling silver.
The following two photos show one I did on an Aristo two bay hopper that I'm currently detailing:
As for the other MU hoses, they are originally from the USA Trains F3 model, and they are made in exactly the same way as explained above. I have some some more cars sitting on the bench so I'll try to remember to post more pics to better illustrate the process!