HOBG - 19mm gauge: This represents HO Scale Broad Gauge. Indian Broad gauge when converted to HO Scale comes to 19.25mm, however, no commercial tracks exist with that gauge. So we have made HOBG with the nearest commercially available track system called P4 gauge. P4 gauge is 18.84mm which is rounded off to 19mm gauge for ease of interpretation. As of now, this is for Puritans and our offering is limited to pure display models and custom orders.