data:extend(
  {
    {
      type = "int-setting",
      name = "angels-crawlertrain-tier-amount",
      setting_type = "startup",
      default_value = 1,
      minimum_value = 0, --0 disables
      maximum_value = 5,
      order = "a[trains]-a"
    },
    {
      type = "int-setting",
      name = "angels-petrotrain-tier-amount",
      setting_type = "startup",
      default_value = 1,
      minimum_value = 0, --0 disables
      maximum_value = 5,
      order = "a[trains]-b"
    },
    {
      type = "int-setting",
      name = "angels-smeltingtrain-tier-amount",
      setting_type = "startup",
      default_value = 1,
      minimum_value = 0, --0 disables
      maximum_value = 5,
      order = "a[trains]-c"
    },
  }
)