I phone Merseyrail:
"When does your last train leave Liverpool for Chester tonight?"
"Our system closes down at 20.00."
"But when does your last train leave Liverpool?"
"Because of adverse weather conditions we're running a half-hour service across the network."
Are you saying that your last train to Chester leaves Liverpool Central at 20.00?"
"I'm saying that because of the cold weather you shouldn't leave it any later than that. I'm just giving you sensible advice."
"I don't want sensible advice. I want accurate information. When does your last train leave Liverpool Central for Chester?"
"That's after 20.00. So can I leave Liverpool at that time to get to Chester?"
"We're running a half-hourly service till 20.00. I can't forecast the future."
"Forecasting the future is what railway timetables are all about."
"I apologise for trying to help."
I ended the call at that point.