a) As soon as Gandhi entered the train, he felt some hostile glances.
b) People kept staring at him as long as he stayed on the train.
c) Gandhi had to stop there while/meanwhile , the other passengers travelled on.
d) He stayed in the cold for hours, until the sun rose again.
e) He had been there since midnight when an idea flashed through his mind.
f) Once sitting in the cold, he realized he had not had dinner yet.