My daughters came from Cheshire to visit me in London in 1983. One was heavily pregnant and one had a six-month old baby in her arms. They had to stand because nobody offered them a seat. I asked them why they didn't just ask somebody, but they were too shy.
I find it difficult to lift my very heavy suitcases onto Swiss trains because they have very high steps, but if nobody offers to help I just ask any likely-looking man and they usually look rather embarrassed at not having offered and do it without any problem.
I have only had one bad experience - I was travelling on a French train and my platform was across the rails. There was a steep staircase up to the footbridge and another steep staircase down on the other side. I asked a station employee if there was a lift, and was told there was not, so I asked, very politely, if there was somebody who could help me carry my case and was told there was not, with a Gallic shrug. There did not happen to be any travellers about. This is not typical of French manners, I hasten to add - perhaps this person just did not like my accent.