Podlew should refere to grouting. Punktowy is spot or point.

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ISO-Flex Rail Grout
Lowest Unit Cost in the Industry for Type 1 and Type 2 Elastomeric Rail Grout

ISO-FLEX is an American-made Elastomeric Rail Grout polyurethane elastomer, providing vibration dampening and electrical isolation while holding the rail secure. ISO-Flex cures to a hardness and durometer specific to supporting the rail loads with minimal deflection, while absorbing movement and vibration without cracking or separation from the substrate surfaces.

Our successful compound adheres to both concrete and steel rail ensuring the best solution for your specialty Embedded Track Installation. ISO-Flex rail grout is compatible with Railboot and maintains the desired track modulus properties, while ensuring proper electrical isolation.

https://www.ironhorseeng.com/elastomeric-rail-grout?gclid=Cj...

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Iso-Flex® Rail Grout
Manufactured by LymTal International
PRODUCT DESCRIPTION
Iso-Flex Rail Grout is a two-component, aliphatic polyurethane elastomer.
https://docs.wixstatic.com/ugd/22f3a7_2c02179e79b546ce8f0fa5...

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Pneumatic injection is usually associated with rich-mix spot grouting.
https://books.google.com/books?id=ygKio-Ks0doC&pg=PA355&lpg=...

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Note added at 4 hrs (2019-10-08 12:54:02 GMT)
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Podlew punktowy
https://www.tinescg.com/wp-content/uploads/2017/07/przekroj_...
https://www.tinescg.com/infrastruktura-szynowa/podlew-punkto...