Can Jains Use the Metro or Basement Parking?

Yes — using a metro or a basement car park is not forbidden, and the reason why is more interesting than the answer. It turns on a distinction that governs a great deal of Jain daily practice.

Earth is alive: prithvikaya

Jainism counts earth itself among the living. The six classes of embodied life (jivanikaya) are:

1. Prithvikaya — earth-bodied
2. Apkaya — water-bodied
3. Teukaya — fire-bodied
4. Vayukaya — air-bodied
5. Vanaspatikaya — plant-bodied
6. Trasakaya — the mobile beings, from two-sensed upward

The first five are ekendriya — one-sensed, possessing touch alone. Soil, clay, stone, salt, lime and the mineral pigments are not raw material in this view. They are bodies.

So the question is a real one, not scrupulosity. If earth is alive, what happens when you tunnel through it?

The hinge: sachitta and achitta

Everything rests here.

• Sachitta — living, still possessed of the life-force
• Achitta — rendered lifeless, the body no longer inhabited

Earth in the ground is sachitta. But once it is quarried, crushed, fired, mixed, and cured, it becomes achitta. The corpus states the principle directly: these substances count as prithvikaya — "but when they have been processed…" they no longer do.

The consequence is decisive. Set concrete, fired brick, dressed stone, smelted steel and finished glass are achitta. A metro tunnel lined with concrete, a basement slab, a paved platform — these are dead matter. Walking through a finished station, parking on a poured floor, riding a train through a bored tunnel involves no injury to earth-bodied beings at all.

Then where is the harm?

In the digging, not the using — and it was done by the excavator, not the passenger.

But Jainism does not let a beneficiary off quite so lightly, because it recognises three modes of owning an act: doing it (krita), causing it (karita), and approving it (anumodana). A commuter has not dug and has not commissioned the digging. Riding a public train is not a celebration of the excavation. But a person who lobbies for needless excavation, or takes satisfaction in it, has moved closer to it.

There is also the general category of arambhaja himsa — the violence unavoidably entailed by householder life. Jain teaching for the layperson has never been that such harm can be reduced to zero. It is that it should be known, limited and regretted, never treated as nothing.

Monks and laypeople are held to different standards

This is where the real strictness lives, and it is monastic:

• For an ascetic, to stand, sit, perform kayotsarga or sleep on sachitta earth* is a recognised fault — the texts class the offender as shabala***, stained in conduct.
• Even wind-blown dust is sachitta rajas and is called samyama-ghataka, destructive of restraint.

This is why monks walk barefoot with a rajoharana, and why they will not dig, will not travel by vehicle, and will not initiate construction. A sadhu's restrictions here are not the shravak's. Reading the monastic rule as though it bound the householder is one of the commonest mistakes made about Jainism.

What is actually asked of a lay Jain

Not abstention — parimana, measure. The layperson's instrument is the vow of limitation, and the niyam texts are strikingly concrete: they cap the prithvikaya substances a person will use in a day by weight — one such reckoning sets a ceiling of about twenty kilograms, with an explicit jayana (exemption of careful necessity) for ordinary household work.

That is the shape of the whole answer. The tradition does not tell you to avoid the metro. It asks you to:

• know that earth is a body, not a substance
• limit what you consume rather than treating it as limitless
• prefer the shared to the private — a metro carrying a thousand people is, in arambha terms, far cheaper per person than a thousand cars
• not rejoice in destruction merely because it is convenient

The rider is clear. The developer who excavates a hillside for a basement nobody needs is the one the doctrine is actually addressing.