4016
However , during the 1960 s many of the secondary lines that they were used on were closed and following the arrival of the 181 Class , the 101 s were relegated to goods , permanent way and pilot duties .
 vehicle: 181 Class
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 vehicle: 181 Class