Jumping for blonde's

A blonde is walking sown the road when shes sees a Brunette jumping up and down on railroad tracks saying "44, 44, 44.." and so on. The blonde decides to join her and they are both jumping up and down saying 44 44 44 a train is coming and the brunette jumps off the tracks while the blonde is stil saying 44 44 44 

after the train has gone by the brunette gets back on and says 45 45 45.