There are a variety of answers. Traffic could be one, or schedule changes. For trains, probably the latter reason.
yes
3am
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She does not always come late.
Always Late with Your Kisses was created in 1951.
Someone who is always late is called tardy, a procrastinator, and terminally late.
You are always late for class.
Yes, someone is always hiring there.
Always is an adverb of frequency, tells us how often. It modifies the adjective "late."
because he sleeps in to late!
my bus is always late
Look on either the exhaust manifold or exhaust pipe.