I have the 1941-1945 ICC Class I railway freight commodity statistics. Each runs about 200 11x17 pages.
For each class I railway, it lists the number of tons shipped for the year in four categories:
- Originated on home road and delivered on the home road - Originated on home road and delivered to connecting carrier - Received from connecting carrier and terminated on the home road - Received from connecting carrier and delivered to a connecting carrier
In 1941, Class 1 Railways originated 76,692 carloads of bananas carrying 820,614 tons, generating $12.4M in revenue. Average revenue per ton was $15.
It is not an insignificant effort to compile the stats for all railways, but a quick scan revealed that the ICRR did load over 179,000 tons of bananas - which is a pretty hefty chunk of the US total. The ICRR also received another 69,000 tons from other carriers. The ICRR delivered 139,000 tons to other carriers. A total of 23,457 carloads were hauled by the ICRR, with revenue of $2.96M (almost 25% of the US total.)
Some west coast roads also originated banana traffic (e.g. NP at 6,500 tons), although not to the extent of the total for southern and east coast roads