I always see people seem to know all the parts of locomotives in other threads. I'm not sure where to learn this info myself so I'm just going to go direct and ask:
What are the blue arrows pointing to? What is the real life counterpart? I know there are chains attached to these in real life because I was looking at photos of real RS3's for some modelling ideas to upgrade my LC+2.0 RS3's. Are they some sort of brake cylinders? I always thought slowing the power to the electric motors and using brake shoes were the methods to slow diesel locomotives but this close inspection of my models' trucks made me realize I didn't actually know.
Same question for the red arrows. I assume they're air reservoirs but what exactly are they holding air for? The whole locomotive? Are they powering the items in the blue arrow question?