What is the Entered service date of the H1 Locomotive?
CREATE TABLE table_name_54 (entered_service VARCHAR, locomotive VARCHAR)
SELECT entered_service FROM table_name_54 WHERE locomotive = "h1"
### Context: CREATE TABLE table_name_54 (entered_service VARCHAR, locomotive VARCHAR) ### Question: What is the Entered service date of the H1 Locomotive? ### Answer: SELECT entered_service FROM table_name_54 WHERE locomotive = "h1"