What does 'platform' mean?

[jacq]

Test No. incompl/inter-46 "Speaking 3 (At the Station)", question 1

The train now ......... at the platform 6 is the 10.45 for London.

(a) sitting
(b) standing
(c) waiting
(d) remaining

Test No. incompl/inter-46 "Speaking 3 (At the Station)", answer 1

The train now standing at the platform 6 is the 10.45 for London.

Correct answer: (b) standing
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what is the meaning of platform?

jacq

[Torsten]

A platform is a raised area in a train station from which passengers board the train.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Sipa2008]

why is not waiting? thaks.

[Rag Ram]

We call something as waiting only when it has crossed its limited time.

eg. The train which is suppose to start by 10.45 is still waiting.
(consider it is 11 now)