There was more than one orphan train. All told, the orphan trains ran from New York to parts of the American west from 1853 - 1929. The orphan trains relocated approximately 250,000 children during these 76 years.
It could mean 'tradition', 'origin', 'orphan' among many others. [Japanese words between 1 and 3 syllables long can usually have a wide variety of meanings, depending on how they are written (kanji). Without the context or kanji provided I can't provide you with your exact answer.]