How do I slow down?

Im getting back into Blender again and to refresh the memory I thought I would have a go at Neal Hirsigs Stephenson`s Rocket tutorial. I have finished modelling the engine and have started animating but having inserted a keyframe for the engine at frames 1 and 234, where I have it stopping, it looks to be travelling too fast. How could I make the train reach the same point but do it a little more slowly ?

edit - it`s ok I figured it out. Move the keyframes further down the timeline.