Error in quotes: "0" instead of 0 in the settings.lua file
{
type = "int-setting",
name = "train-announcer-position-x",
setting_type = "runtime-per-user",
default_value = "0"
},
{
type = "int-setting",
name = "train-announcer-position-y",
setting_type = "runtime-per-user",
default_value = "0"
}