Address Warnings that occur during pipeline running.

[Antonio-John]

Steps

-Some warnings are appearing whilst the Scotland pipeline is running, these include about dtypes & read_csv.

-Investigate why these warnings are occurring and attempt to resolve them. For read_csv a schema could be supplied. Then for dtypes look for spurious/different values in columns e.g a string in an integer column.

[nkshaw23]

Adding this one when running train and bus timetable scripts