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+% RWT(7ADVTRAINS) | Advtrains Developer's Manual
+
+# NAME
+`rwt` - Advtrains railway time
+
+# DESCRIPTION
+Advtrains depends on Minetest's "dtime" for most operations, and may slow itself down when necessary to prevent unexpected behavior, such as in a situation with a significant amount of lag. As a result, the internal time used by Advtrains is not synchronized to real-life time due to lag and server restarts. Railway time was therefore introduced as a method of accurately measuring internal time and, with this information, implementing a scheduling system. It can, however, also be set up to keep in sync with real-life time.
+
+Railway time is counted in cycles, minutes, and seconds, roughly corresponding to their real-life counterparts, with cycles roughly corresponding to hours. For a valid railway time object, it is expected that
+
+* The "cycles" element is an integer,
+* The "minutes" element is an integer between 0 and 59 (inclusive), and
+* The "seconds" element is an integer between 0 and 59 (inclusive).
+
+Railway time may be represented in three formats:
+
+* As a table with the `c`, `m`, `s` fields holding the cycles, minutes, and seconds, respectively,
+* As a string with the cycles, minutes and seconds delimited with a semicolon,
+* For zero cycles, as a string with the minutes and seconds delimited with a semicolon, or
+* As a number representing the number of seconds since 0;0;0.
+
+If railway time is represented as a string, each element may have a variable length and do not require padding zeroes, and an element of the string may be empty if it is at the beginning or the end of the string.
+
+The railway time API is available in the `advtrains.interlocking.rwt` table or, for LuaATC, in the `rwt` table.