While many farmers count the cost of the hot, dry summer, some have benefited from the conditions.
Buses are due to replace trains between Brockenhurst and Lymington Pier until the end of the day.
One village resident chained himself to the bridge as demolition work was due to begin.
Visitors are reminded to stay back from free-roaming ponies and other livestock in the national park.
The New Forest and Hampshire County Show traces its origins to village event in 1920.
A full service is expected on the Brockenhurst-Lymington line from Thursday.
One train per hour is running between Brockenhurst and Lymington Pier at a reduced speed.
Passengers going between Brockenhurst and Lymington Pier will need to use a rail replacement bus.
Maisy, 15, suffered multiple bleeds on the brain in a Boxing Day riding accident.
