Springers are pretty much semi scale models. Identifying it's scale may be difficult. Does your springer have any figures on it? If it does divide 1800 by the height of the figure and that will be your scale. For example, if your crew are 75mm tall 1800 divided by 75 = 24 so you figures are 1/24th scale.

Standard ISO shipping containers are 8ft (2.43m) wide, 8.5ft (2.59m) high and come in two lengths; 20ft (6.06m) and 40ft (12.2m). So to 1/24th scale divide the metric size by 24 e.g. 2430 divided by 24 = 101mm.