I am planning to take two field trips on April 9 and April 16. Each trip would have 25-30 kids. I've done an Amtrak field trip before back in 2014. We would board at Elizabethtown and ride to PHL and back again. We are planning to spend the day at the Franklin Institute science museum. When should I inquire about group rates? I remember Amtrak gave a nice discount when I took 60 kids back in 2014.