A lovely post. I'm saying nothing more on this subject, other than to wholeheartedly agree with this:
"When seen from the London train, it tells me I am nearly home. In fact, optical illusion though it may be, it appears to be galloping in the same direction."
You and I have probably seen that view from the train more times than any of the other contributors to this particular thread. The horse does absolutely appear to be galloping in the same direction as the train.