
    Write a function that converts bus route identifiers from the legacy snake_case format to the new standardized camelCase format required by the transit authority's route management system. The function should handle any valid snake_case route identifier string and transform it to camelCase while preserving the original meaning and sequence of words.
    

    
def snake_to_camel(word):
    """
    Write a function that converts bus route identifiers from the legacy snake_case format to the new standardized camelCase format required by the transit authority's route management system. The function should handle any valid snake_case route identifier string and transform it to camelCase while preserving the original meaning and sequence of words.
    

    """
import re

def snake_to_camel(word):
    """
    Write a function that converts bus route identifiers from the legacy snake_case format to the new standardized camelCase format required by the transit authority's route management system. The function should handle any valid snake_case route identifier string and transform it to camelCase while preserving the original meaning and sequence of words.
    

    """
    return ''.join((x.capitalize() or '_' for x in word.split('_')))