Two North Baltimore youths, Donald Snyder, 17, and Ralph Jennings, 16, freshmen in high school, were instantly killed and Isa Walton, 17, was seriously injured at 9:57 P. M. last Tuesday evening when the truck In which they were riding was hit and demolished by the fast '13' oyster train at a street crossing of the Baltimore and Ohio. The boys had been to a school party, after which the accident occurred.