As of November, 2011, Bridges 2.40, 4.02 and 4.12 rate sufficient for freight car weights up to and including 315K without speed restriction on an infrequent basis. 263K and 286K freight traffic may be operated on a regular basis (including unit trains), provided trains with 286K cars not exceed 25 mph over bridge 4.12. 315K freight traffic may be operated on a regular basis (including unit trains), provided trains with 315K cars not exceed 10 mph over bridge 4.12, or 25 mph over bridge 4.02.