I work in a bank and I have always wondered why our relationship managers, i.e. sales representatives, are commonly referred to as "the platforms," or "the platform officers."
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A platform officer is a banker who advises the public with the bank's accounts and services, and helps arrange them. The term dates back to at least the early 20th century.
These officers are also known as platform officers, or as in your bank, platforms for short.
Here's a job ad from The Miami News, Feb 13, 1971 showing it's a front-of-house customer-services job:
From the Sarasota Herald-Tribune, Jan 23, 1969:
The following are Google Books snippets and the years may be wrong but they look plausible.
The Bankers Magazine - Volume 128 - Page viii, 1934:
Trust Companies - Volume 67 - Page 25, 1938:
Proceedings of the Common Council of the City of St. Paul - Page 533, 1917:
Annual Report - Page 29, Saint Paul (Minn.). Bureau of Health, Saint Paul (Minn.). Dept. of Health, Saint Paul (Minn.). Commissioner of Health - 1915: