Timetable abbreviations in Spanish speaking countries

In Spanish speaking countries what (if any) abbreviations are used for the days of the week on train timetables? In the USA we use: M, T or Tue, Th. etc. or daily for 7 day a week service.

What is the equivalent in Spanish speaking countries for lunes, domingo, etc. And is there a designation for daily or weekday abbreviation?

Anyone know how this is listed in Portuguese (as in Brazil) train timetables?

T2

In Spain on Renfe timetables the abbreviations used are LMXJVSD for the days of the week, and Diario for daily trains. As example, a train noted L***VS* runs on mondays, fridays and saturdays (X is used for miercoles-wednesday to avoid confusion with martes).